Now you're onto the opportunity to improve on the 2009 front end.
I presume that the curved edge in attachment 1 is this:
https://www.partsgeek.com/catalog/20...nder_well.html
...and that it's a generic Golf/Jetta wheel well
https://cdn4.pelicanparts.com/techar...mall/pic07.jpg
What you could implement is an air curtain
https://www.motortrend.ca/en/news/vo...age-new-video/
The example shown is from a 2017 performance package. I don't have more information, yet.
An air curtain is like putting a fender skirt on the front wheel. One 'performance' mod that helps efficiency. Home-brewing a solution is an interesting proposition.
Try luring aerohead back into the conversation.